i has not shutdown yet.. execpt for once but living room is a place where air con is on for most of the day and night so it stays cooler of the time...shut down temp is set to 60C in bios and the pc is doin good even with all the gaming my bro does on it..but with the heat sink fan doin close to 4000 rpm.. it sounds more like a hover craft of\r vacum cleaner 
anyway first time in my life ima rig out a good heat sink and slam in on the cpu with some proper support for its weight..basically the whole weight of the heat sink will be on the case with the help of an aluminum arm while the heat sink is well intact to cpu die..
dont ask abt the size of the heat sink. u would rather not belive it..but sure it helps to make is quiet :)
1MB cache helps a lot.. windows and applications starts twice faster now..
i guess north pole has some definate use in future..with all these scotts giving heat like a neuclear reactor core, all companies will want to relocate their data centers to north pole.. thefore estate prices gonna hike up! so reserve ur land now!!